1. Cisco Nexus 5548
2. Serial Number Cisco Nexus 5548 Password Recovery Tool

At some point, it's a good idea to conduct a router inventory to determine which routers you have as well as their models, RAM, Flash, IOS versions, and serial numbers. I mention the serial number specifically because you need it to both track your routers and to register for a Cisco SMARTnet service contract.

How do you collect these numbers without physically going to each and every router in your organization? Here's how to determine those serial numbers remotely.

Cisco CCNA Data Center 640-916 Exam Vendor：Cisco Exam Code: 640-916 Exam Name: Introducing Cisco Data Center Technologies - DCICT. Which command pings from the Cisco Nexus 5548 interface mgmt 0 to host 10.10.1.1? Ping -m 10.10.1.1. Which command would you use to determine the serial number used to apply for a Product Activation Key? Link between ASA 5525 and Nexus 5548UP. Unanswered Question. Facebook; Twitter. Serial number is CIB170601156 nominal bitrate is 0 MBit/sec Link length supported for copper is 100 m cisco id is --cisco extended id number is 4. SIL-CORE-SW01# sh int eth1/18 Ethernet1/18 is down (Link not connected). Re: How to locate the device serial number using show version or show inventory command James Feb 5, 2012 7:19 PM ( in response to Busa_1300 ) I would use a show verision, this will show the S/N and the IOS of the equipment.

Issues to consider

Re: Cisco MIB for Serial number of device packetman@kc.rr.com Nov 8, 2012 5:54 PM ( in response to jonchill ) Actually, I have done this, and have it displaying at the bottom of the page.

One challenge with determining the serial number of your router is that there are so many different serial numbers — the processor board ID, serial numbers on every interface card, the chassis serial number, and many others.

In some cases, you may even find that none of the serial numbers that you find by connecting to the router actually match the serial number on the sticker on the outside of the router. In addition, the results that you get will vary from router platform to router platform.

On newer routers such as the Cisco 2800 Series and 3800 Series, the serial number on the outside of the router, the processor ID, and the hardware chassis serial number are all the same. Even better, you can access this unique number via Telnet, SSH, or SNMP.

On the other hand, older routers make things more confusing. For example, if you have a Cisco 2500 Series router, you can't find the number on the sticker on the outside of the router by connecting to the device over the network. In fact, I opened up a Cisco TAC case, and they told me this was 'by design.'

One workaround to this issue is to manually enter the physical serial number from the outside of the router into the configuration of the router. That way, you can access it via SNMP.

You can manually set the chassis serial number using the following command:

For more information, check out 'How To Collect Chassis Information (including the Chassis Serial Number) For Routers And Catalyst Switches Using SNMP' on Cisco's Web site.

How do I find the serial numbers?

Here are three options for remotely retrieving serial numbers over the network. These solutions assume that you have a newer router in which the output of the serial number from the IOS matches the physical router serial number, that you have programmed the serial number into the IOS, or that you are comfortable using the serial number that the IOS provides.

Due to the varied number of routers and the varied functionality in the router IOS between versions and router models, I can't guarantee that the following steps will work on your router or in your IOS. While I have searched for a slick, easy method to retrieve router serial numbers across all router models and IOS versions, I haven't come across a solution yet.

Option 1: Telnet or SSH

The easiest way to retrieve the serial numbers from your router is to Telnet or SSH to the router and use the show inventorycommand. Here's a sample of the output:

The chassis hw serial# section designates the serial number that is physically on the router.

Option 2: Use SNMP from the command line

You can retrieve the same chassis hardware serial number from the command line using simple network management protocol (SNMP). I did this in Windows XP by downloading two free utilities, using a text file as my source list of routers, and writing a short windows .bat file to process it for me. (If you have Linux, you should already have the snmp-get command and awk command available.)

To begin, download the Net-SNMP tools so you can use the snmpget command. You can use this tool to get the chassis hw serial# information from a single router with a single command. Here's an example:

The output looks like this:

If you want to write a batch file to automate the process, follow these steps:

1. Download Gawk for Windows (awk) to parse the output from the snmpget command.
2. Install both tools in the same directory.
3. Create a text file that lists the router hostnames or IP addresses; name it Routers.txt.
4. Put the following in a batch file (I called mine Getsnscript.tx) and run it:

The output might look something like this:

If you want, you can redirect it to a text file and import that text file to a spreadsheet. Of course, you can also get much more complex with the script and retrieve more information.

For more information on the SNMP string I used, check out the Cisco's Unique Device Identifier Retrieval Web page.

Option 3: Use SNMP from a GUI application

Of course, there are always GUI applications that can accomplish the same thing as CLI scripts. I've found that Kiwi CatTools (freeware for up to five devices) does a fine job of retrieving the serial number of routers and provides a nice inventory. Figure A offers a snapshot of the Kiwi CatTools output.

Figure A

In addition, I checked with PacketTrap, and its pt360 Tool Suite will begin supporting this feature in the next release. Perhaps there are other applications out there that you've used before. If so, please share them in the discussion area.

Another thought I had was to write a TCL script to retrieve serial numbers. However, since I'm not a TCL programmer, this probably isn't the best option for me.

Conclusion

If your routers are newer and the results of the show inventory command are accurate, you should be able to easily retrieve your router's proper chassis serial number remotely over the network. However, with older models, you may have to first manually enter the router serial number into the IOS to be able to remotely retrieve it.

Inventorying your routers' serial numbers is an important activity that every network administrator needs to be able to do — both to keep track of what you have and to properly register for support and maintenance from Cisco Systems.

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Cisco Nexus 9K POAP Scripts

Description

These python scripts perform very simple POAP (Power-on Auto Provisioning) for the Nexus 9K Switches. The purpose of these scripts are to automate the process of upgrading software images and installing configuration files on devices that are being deployed in the network for the first time.

Prerequisites for POAP

The following are required for the basic POAP functionality

• DHCP Server
• TFTP Server
• FTP/SFTP Server
• POAP python script
• NXOS Image
• Configuration File

High-Level Steps

• Configure DHCP Server
• Modify poap.py for POAP workflow
• Download images and configuration files
• Power on Switch
• Verification

Versions of Python Scripts

poap.py

• Script will update IOS image based upon variable in script
• If NXOS on switch does not match the 'n9k_image_version' variable it will download the new image and replace it
• Download conf and apply this configuration to all switches

poap-sn.py

• Same as poap.py but script will determine the serial number of the switch and download a custom conf.{Serial Num} specific for that switch

Detailed Steps

Configuration of DHCP Server

Any DHCP Server can be used, but you will need to specify two DHCP options within the pool:

• Option 150 - Specifies the IP Address of the TFTP Server on the network
• Option 67 - Specifies the name of the POAP Script that will be executed

The following shows the example for configuring IOS DHCP:

Modification of Script

Cisco Nexus 5548

The script will need to be modified to include the required information on the location of configuration files as well as the image files. The following are the variables defined in the scripts that should be modified:

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• n9k_image_version - Version of code to install on switch
• config_file_src - location of the configuration file
• image_dir_dst - location of the image destination (Normally bootflash:)
• protocol - Protocol used to download images and configuration
• username - username for the server to download images and conf
• ftp_username - username for the server to download images and conf
• password - Password for the above server
• hostname - hostname or ip address for the above server

After the modification of the script, an embedded MD5 hash must be regenerated. The Nexus 9K switches use this information to ensure the integrity of the POAP script file. I do the following:

• Delete the line in the script file prefixed by: '#md5sum'
• Recalculate the hash:

• Add the '#md5sum' back into the POAP file with the newly generated hash in the above step

Download Images and Configuration Files

The above directory structure shows the files required

• conf - The configuration file that will be applied to the 9K switch
• conf.md5 - A file containing an MD5 hash of the configuration file to ensure integity
• n9000*.bin - The Nexus 9K image downloaded from cisco.com to be installed on the switch
• n9000*.bin.md5 - md5 Hash of the above Nexus 9K image to ensure integrity
• poap.py - Python script for the POAP functionality

Power on Switch

Serial Number Cisco Nexus 5548 Password Recovery Tool

The Console of the switch will provide great debugging opportunities:What will happen if everything is successful:

• POAP initiated

• Initiate the DHCP Process

• Nexus 9K downloaded the poap.py via TFTP

• Downloaded the nxos image using FTP
• Downloaded the configuraiton file using FTP
• Modified the boot variables on the switch
• Copied the file to 'scheduled-config' which will be automatically applied at Startup